Komatsu Galeo PC800-8 Shop Manual page 834

SEN00794-02
H-29 Fan rotation is abnormal (Fan sound/vibration is abnormally large
or fan overheats)
Failure
• Fan rotation is abnormal (Fan sound/vibration is abnormally large or fan overheats)
phenomenon
Relative • Measure fan speed to see if it is out of service limit values.
information • Carry out all troubleshooting in work mode P and fan 100% speed mode.
Defective fan pump EPC
1
current output
Possible causes
and standard
value in normal
Malfunction of fan pump
state
2
EPC solenoid valve
Trouble in fan pump or fan
3
motor
40
Cause Standard value in normalcy and references for troubleshooting
aCarry out troubleshooting with engine running at high idle.
aCarry out troubleshooting with engine running at high idle.
If causes 1 and 2 are not detected, fan pump or fan motor may be defec-
tive. Check them directly.
Control levers
All levers in neutral
Control levers
All levers in neutral
40 Troubleshooting
Fan pump EPC current
630 ± 50 mA
Fan pump EPC solenoid valve
output pressure
1.72 ± 0.05 MPa
{17.5 ± 0.5 kg/cm }
2
PC800, 850-8